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Move main.go config into controller package (#198)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,113 @@ | ||
| package controller // import "go.opentelemetry.io/ebpf-profiler/internal/controller" | ||
|
|
||
| import ( | ||
| "errors" | ||
| "flag" | ||
| "fmt" | ||
| "runtime" | ||
| "time" | ||
|
|
||
| log "github.com/sirupsen/logrus" | ||
| "go.opentelemetry.io/ebpf-profiler/tracer" | ||
| ) | ||
|
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| type Config struct { | ||
| BpfVerifierLogLevel uint | ||
| CollAgentAddr string | ||
| Copyright bool | ||
| DisableTLS bool | ||
| MapScaleFactor uint | ||
| MonitorInterval time.Duration | ||
| ClockSyncInterval time.Duration | ||
| NoKernelVersionCheck bool | ||
| PprofAddr string | ||
| ProbabilisticInterval time.Duration | ||
| ProbabilisticThreshold uint | ||
| ReporterInterval time.Duration | ||
| SamplesPerSecond int | ||
| SendErrorFrames bool | ||
| Tracers string | ||
| VerboseMode bool | ||
| Version bool | ||
|
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| Fs *flag.FlagSet | ||
| } | ||
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| const ( | ||
| // 1TB of executable address space | ||
| MaxArgMapScaleFactor = 8 | ||
| ) | ||
|
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| // Dump visits all flag sets, and dumps them all to debug | ||
| // Used for verbose mode logging. | ||
| func (cfg *Config) Dump() { | ||
| log.Debug("Config:") | ||
| cfg.Fs.VisitAll(func(f *flag.Flag) { | ||
| log.Debug(fmt.Sprintf("%s: %v", f.Name, f.Value)) | ||
| }) | ||
| } | ||
|
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| // Validate runs validations on the provided configuration, and returns errors | ||
| // if invalid values were provided. | ||
| func (cfg *Config) Validate() error { | ||
| if cfg.SamplesPerSecond < 1 { | ||
| return fmt.Errorf("invalid sampling frequency: %d", cfg.SamplesPerSecond) | ||
| } | ||
|
|
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| if cfg.MapScaleFactor > 8 { | ||
| return fmt.Errorf( | ||
| "eBPF map scaling factor %d exceeds limit (max: %d)", | ||
| cfg.MapScaleFactor, MaxArgMapScaleFactor, | ||
| ) | ||
| } | ||
|
|
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| if cfg.BpfVerifierLogLevel > 2 { | ||
| return fmt.Errorf("invalid eBPF verifier log level: %d", cfg.BpfVerifierLogLevel) | ||
| } | ||
|
|
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| if cfg.ProbabilisticInterval < 1*time.Minute || cfg.ProbabilisticInterval > 5*time.Minute { | ||
| return errors.New( | ||
| "invalid argument for probabilistic-interval: use " + | ||
| "a duration between 1 and 5 minutes", | ||
| ) | ||
| } | ||
|
|
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| if cfg.ProbabilisticThreshold < 1 || | ||
| cfg.ProbabilisticThreshold > tracer.ProbabilisticThresholdMax { | ||
| return fmt.Errorf( | ||
| "invalid argument for probabilistic-threshold. Value "+ | ||
| "should be between 1 and %d", | ||
| tracer.ProbabilisticThresholdMax, | ||
| ) | ||
| } | ||
|
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||
| if !cfg.NoKernelVersionCheck { | ||
| major, minor, patch, err := tracer.GetCurrentKernelVersion() | ||
| if err != nil { | ||
| return fmt.Errorf("failed to get kernel version: %v", err) | ||
| } | ||
|
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||
| var minMajor, minMinor uint32 | ||
| switch runtime.GOARCH { | ||
| case "amd64": | ||
| if cfg.VerboseMode { | ||
| minMajor, minMinor = 5, 2 | ||
| } else { | ||
| minMajor, minMinor = 4, 19 | ||
| } | ||
| case "arm64": | ||
| // Older ARM64 kernel versions have broken bpf_probe_read. | ||
| // https://github.com/torvalds/linux/commit/6ae08ae3dea2cfa03dd3665a3c8475c2d429ef47 | ||
| minMajor, minMinor = 5, 5 | ||
| default: | ||
| return fmt.Errorf("unsupported architecture: %s", runtime.GOARCH) | ||
| } | ||
|
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||
| if major < minMajor || (major == minMajor && minor < minMinor) { | ||
| return fmt.Errorf("host Agent requires kernel version "+ | ||
| "%d.%d or newer but got %d.%d.%d", minMajor, minMinor, major, minor, patch) | ||
| } | ||
| } | ||
|
|
||
| return nil | ||
| } |
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